Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
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Also am I able to add devices to the authenticator as a backup like my pc or a tablet or another laptop?
You can follow along here.
https://techcommunity.microsoft.com/t5/azure-active-directory-identity/how-it-works-backup-and-restore-for-microsoft-authenticator/ba-p/1006678
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